Electrical condenser



y 31, 1932- w. H. GOODMAN 1,861,006

ELECTRICAL CONDENSER Filed Nov. 15, 1926 2 Sheets-S eet 1 -lNVE TO Wile/11y ATTORNEY y 1932- w. H. GOODMAN 861,006

ELECTRI CAL CONDENSER Filed Nov. 15 192 2 Sheets-Sheet 2 5 i NVENTOR I 1 fl eflfymm II] '1 I WY r 3 BY l j 6 I ATTORNEY Patented May 31, 1932 UNITED STATES PATENT OFFICE WILLIAM HENRY GOODMAN, OF LONDON,

DENSER CORPORATION, OF NEW YORK,

ELECTRICAL CONDENSER Application filed November 15, 1926, Serial No.

This invention relates to electrical condensers and has particular reference to condensers of the roll or spool type in which the condenser elements are wound upon a central tube or former which may, if desired, be used as a support for the finished condenser.

In the manufacture of such condensers, some form of dielectric impregnating material is used to impregnate the paper and for the production of a satisfactory condenser it is essential that this impregnating material should reach all parts of the condenser. An object of the invention is to provide an improved form of condenser of the character above specified and, in particular, an 1mproved form of former or mandrel by which access of the impregnating medium to the interior parts of the condenser is facilitated.

Condensers of the above character are also liable to become overheated owing-t0 the fact that the heat evolved in the central part of the coil cannot readily escape and it is a further object of the invention to provide an improved form of condenser in which this difliculty may be more readily and efiiciently overcome.

Another object of the invention is to provide an improved form of former or core which will lessen considerably the cost of manufacture of this type of condenser.

A further object'of the invention is to provide improvements in the mode of mounting or supporting such condensers.

The invention consists, in a former for the winding of condenser of the roll or spool type comprising a member of prismatic, cy-

lindrical or tubular formation provided (preferably by moulding) with a plurality of grooves, ducts, channelways or conduits for the purpose specified. i

The invention also consists in an electrical condenser comprising sheets or strips of metal-coated paper or thin conducting material; such as metal foil, with separating strips of flexible dielectric material, such as paper, wound upon a central tube or former provided' with a plurality of grooves, channelways or condults.

Preferably the ooves, channelways or conduits are form in or upon the periphery 148,487, and in Great Britain June 21, 1928.

of the former. The purpose of the grooves, channelways or conduits is not only to afford I improved means for enabling an efficient circulation-of the cooling or insulating medium to be effected in the finished condenser, but 5 also to facilitate and cheapen the manufac-' ture of condensers of the type described. In this connection it is pointed out that it is usual after the winding of a condenser of this type to impregnate the paper layers with 00 oil and that the said grooves or channelways materially assist the carrying out of this step. In some instances the former with the condenser elements wound thereon is placed in a vessel which is first evacuated and there- 68 after filled with the impregnating medium. It will be seen that by the use of the im"- proved former produced according to the 7 present invention, impregnation carried out in this manner is rendered more complete in .7 that the grooves or channelways assist in the withdrawal of air from the pores ofthe paper and enable the oil to be brought into close proximity with the layers located in and around the central part of the condenser.

Referring now to the accompanying drawings which illustrate by way of example one convenient mode of carrying the invention into effect Figure 1 is a front elevational view of one form of former produced according to the invention.

Figure 2 is an end view of the former shown in Figure 1.

Figure 3 is a fragmentary plan view show-- 86 ing the preferred manner in which a series of roll type condensers produced in accordance with the invention are mounted in order to produce a multiple condenser; and

1 Figure 4 is a sectional elevation taken on the line H of Figure 3.

In carrying the invention into efiect according to one convenient mode a former is provided by moulding a rod or tube of suitable insulating material with a series of peripheral flutes or grooves extending in a. direction substantially parallel with the longitudinal axis of the former. Preferably the said flutes or grooves are shaped and disposed in such positions that the rod or tube may be moulded in a two-part mould having the joint located in a diametrical plane of the former. It will be appreciated, however, that the formation and disposition of the flutes or groov'es may be varied according to the wishes or requirements of the user and that,

' by moulding in a two-part mould of the cha racter above specified. The former is preferably provided at' each end with suitable extensions or projections-adapted to facilitate the mounting or supporting of the finished or partly formed condenser in an appropriate position for use or for further treatment or completion of manufacture. In the preferred embodiment of the invention the extensions or projections are integral with the body of the formerand are produced in the moulding operation. As illustrated the projections shown at 3 are of square formation or cross section but itwill be appreciated that they may take any other desired polygonal or'non-circular form so as to prevent rotary movement of the finished condenser when mounted for use'. Further, if desired, the projections may take the form of separate screw-threaded studs moulded in or screwed into position at each end of the former.

From Figure 2 of the accompanying drawings it will be observed that one of the flutes or grooves, namely that indicated by the reference 2a, is of lesser depth than some of the other flutes or grooves. This is important in that it provides for a preliminary locking of one end of the paper or foil layers during the commencement of the winding operation. To commence winding the end of the first layer is inserted in the groove 2a and fixed in position by a suitable keying member- -which may take the form of a rod ,of insulating material .,of circular cross section. Successive layers of thin sheet metal or metalcoated paper with separating layers of a suitable dielectric material, such as paper,;

are then wound upon the former until a predetermined thickness of "conducting and dielectric layers has been attained.

Upon the completion of winding it will be seen that an improved forni; of roll or spool type of condenser is provided having a plu rality of channelways orconduits through which a cooling, insulating or impregnating medium may be passed; It will be observed that these spaces or channels formed by the grooves themselves are in contact with the underneath surface of the first layer of the winding and will permit the impregnating medium to be conveyed readily to the inner layers of the condenser winding and will The preferred mode of effecting impregnation is to mount the former upon the 001m pletion of winding in a suitable vessel which is first evacuated and then filled with a suitable impregnating medium such as oil. In (ionnection with thisstep it should be observed that the channelways or conduits provided in the improved condenser produced in accordance with the present invention assist in the removal of air from and ensure more reliable impregnation of the dielectric layers.

Referring now to Figures 3 and 4 which illustrate the preferred mode of assembling a series of roll type condenser units to form a multiple condenser, the rolled condensers are indicated at R R R R etc. and the insulating cores on which they are wound are not shown except for the squared projections 3 extending through the ends of the rolls. The rolls are arranged in rows, each row consisting of a series of rolls mounted and held in position between a pair of channel-shaped strips of metal 5. The lower of each pair of channel-shaped strips of metal is secured to a base 6 or the bottom of the metal tank or container for the multiple conat their upper ends.

In order to tie a number of these rows of condenser rolls together transverse insulating strips 9 are arranged so as to be secured in place by the bolts 7 which pass through them. These insulating strips 9 are used at the upper ends of the bolts 7 only as the lower ends of these bolts are held in place by the fixed metal strips 5.

In this construction the complete condenser is divided up into a number of rows of rolls each of which is independent of the other except insofar as they are tied togetherby the strips 9, and a con enser unit in any one row is thus readily removable for replacement, if necessary, by loosening the nut holding the appropriate upper strip 5 in position. The strip may then be raised sufliciently to permit the removal of any of the condensers which are positioned thereby. Any convenient number of condenser rolls may be included in each of the rows and any convenient number of rows may be mounted in parallel to each other to produce a condenser battery or multiple condenser of the desired Having now particularly described and ascertained the nature of my said invention 5 and in what manner the same is to be performed, I declare that what I claim is 1. A former for a wound condenser comprising a member having a plurality of grooves on the periphery thereof, certain of 1 the grooves being adapted to cooperate with a securing means for certain of the condenser elements, and other of the grooves being adapted as a circulating means for a fluid medium.

15 2. A multiple condenser comprising rows of wound condenser units of the character described, each row consistin of a plurality of condenser units mounted etween a pair of channel-shaped metallic strips, the con- 20 denser units being arranged in a vertical position, the lower channel shaped members being mounted upon a suitable base, and the upper channel-shaped members being tied together by suitable transverse insulating 95 strips,

In testimony whereof I aflix my signature.

WILLIAM HENRY GOODMAN. 

